What is 180 °C in Fahrenheit and gas mark?

350 °F and gas mark 4. This is the single most common baking temperature and worth committing to memory.

Do I lower the temperature for a fan oven?

Yes, by about 20 °C or 35 °F. A fan circulates hot air over the food, which cooks faster than still air at the same temperature.

Oven Temperature Converter

Convert oven temperatures between Celsius, Fahrenheit and gas mark, with fan oven adjustments.

Draft — figures checked, awaiting an editorial read. Not indexed.

Set the oven to— °CNearest conventional setting.

Or, in Fahrenheit: — °F
Gas mark: —
Fan / convection oven20 °C lower than conventional.: — °C
Fan oven, Fahrenheit: — °F
Exact conversion: — °C

Formula: °F = °C × 9/5 + 32, then snapped to the nearest conventional oven setting. Fan ovens run 20 °C lower for the same result.

What this calculates

This converts oven temperatures between Fahrenheit, Celsius and gas mark, and — more usefully — tells you what to actually set the dial to. The arithmetic conversion of 350 °F is 176.7 °C, but no oven has that setting and no recipe means it. It means 180. Recipes are written in round conventional settings, and converting them literally produces numbers that cannot be dialled in. This calculator gives both the exact conversion and the setting a real oven has.

How it works

The input is converted to Celsius using the standard formula, then matched against the table of conventional oven settings, which run in 10 and 20 degree steps and map onto the gas marks. Gas marks are a British scale where mark 1 is 140 °C and each mark up adds roughly 14 °C, though the published table is not perfectly linear. The fan oven figure subtracts 20 °C, which is the standard adjustment printed in most appliance manuals — a fan circulates hot air, so it cooks faster at the same dial setting.

Worked example

A recipe calling for 350 °F: the exact conversion is (350 − 32) × 5/9 = 176.7 °C, which snaps to the conventional 180 °C setting, gas mark 4. In a fan oven, set 160 °C instead. Going the other way, a British recipe at gas mark 6 is 200 °C, which is 392 °F — and would be set as 400 °F on an American oven.

Common mistakes

Using the exact conversion as a dial setting, which is impossible on most ovens and misleadingly precise anyway. Second, forgetting the fan adjustment — running a fan oven at the conventional temperature typically overcooks the outside before the middle is done, and is the most common cause of recipes "not working" in a new kitchen. Third, trusting the dial at all: most domestic ovens are off by 10–20 degrees, and a cheap oven thermometer resolves more baking problems than any conversion does.

Common questions

What is 180 °C in Fahrenheit and gas mark?: 350 °F and gas mark 4. This is the single most common baking temperature and worth committing to memory.
Do I lower the temperature for a fan oven?: Yes, by about 20 °C or 35 °F. A fan circulates hot air over the food, which cooks faster than still air at the same temperature.